钻井液与完井液2017，Vol.34Issue(5)：1-7,7.DOI:10.3969/j.issn.1001-5620.2017.05.001
黏弹性表面活性剂的研制及其在微泡钻井液中的应用
A Viscoelastic Surfactants: Its Development and Application in Micro Foam Drilling Fluids
摘要
Abstract
A viscoelastic anionic surfactant VES-1 has been synthesized with amino-compound and long-chain acryl chloride for use in micro foam drilling fluids. A micro foam mud treated with VES-1 was formulated with selected micelle enhancer and secondary surfactants. The micro foam mud had good viscoelasticity and stable foam. Low shear rate (0.01 r/min) viscosity of the foam mud is 100000 mPa·s, and the half-life longer than 18 min. Based on the formation characteristics of the Wen-23 gas storage, the VES-1 micro foam mud was further treated with foam stabilizer and filter loss reducers to form a micro foam mud of high thixotropy. Laboratory evaluation results have proved its high thixotropy and ability to quickly form network structure inside the mud. The initial (10 s) gel strength of the VES-1 foam mud was at least 12 Pa, and there was only slight difference between the 10 s and 10 min gel strengths. This is especially beneficial to carrying drilled cuttings out of hole and plugging low pressure thief zones to avoid mud losses. VES-1 is apparently superior to the commonly used surfactants (such as OP-10) in mud loss control under pressure. In mud loss experiment, injection of 325 mL of the VES-1 mud at 120 ℃ increased the pressure to above 10 MPa, indicating that this mud can help resolve mud loss problem in low pressure formations. VES-1 micro foam mud also had good pressure resistance; its density increase did not exceed 0.05 g/cm3 under 30 MPa. After aging at 120 ℃ for 16 h, the mud properties remained unchanged. The VES-1 mud is able to resist contamination by 10％ compound saltwater. It also has good lubricity; the friction coefficient of the VES-1 mud is 54％ less than commonly used polymer drilling fluids. Properties of the VES-1 micro foam mud are able to satisfy the needs for the construction of the Wen-23 gas storage.关键词
黏弹性/表面活性剂/微泡钻井液/触变性/低压易漏地层/封堵/储气库Key words
Viscoelasticity/Surfactants/Micro foam mud/Thixotropy/Mud loss in low pressure formation/Plugging/Gas storage分类
能源科技引用本文复制引用
郭金爱,谢建宇,孙举,刘光成,卢国林,杨国涛,谭安平..黏弹性表面活性剂的研制及其在微泡钻井液中的应用[J].钻井液与完井液,2017,34(5):1-7,7.基金项目
中国石油化工集团公司重点项目"枯竭砂岩气田改建储气库钻完井关键技术研究"(JP14028) （JP14028）
中石化中原石油工程公司重点科研项目"微泡钻井液用表面活性剂的研制"(2014207). （2014207）
